[Okeydoker]

The prosecutor chose to file conspiracy to commit mail fraud so that all the defendants are brought in together. There is no practical advantage to charge separate counts of mail fraud.

This might explain it more thoroughly for you:

https://www.nationalreview.com/2020/08/the-bannon-indictment/

[Alberta's Child]

The prosecutor chose to file conspiracy to commit mail fraud so that all the defendants are brought in together. There is no practical advantage to charge separate counts of mail fraud.

The link you posted indicates that the charge was conspiracy to commit WIRE fraud, not MAIL fraud. Surely there's a legal distinction between the two ... which is why I asked about the involvement of a U.S. Postal Inspector in a case where wire fraud is alleged but mail fraud is not. That itself seems very odd to me.